Environmental

Pennsylvania homeowners near former coal mining areas should be especially aware of which water quality issue?

AHigh nitrate levels from agriculture
BAcid mine drainage (AMD) that can contaminate wells and streams with iron, sulfur, and heavy metals✓ Correct
CIndustrial solvent contamination
DElevated mercury from historical thermometer manufacturing

Explanation

Acid mine drainage (AMD) is Pennsylvania's most widespread water quality problem. When underground coal mines flood, water reacts with iron sulfide minerals to form sulfuric acid and dissolve heavy metals. AMD affects thousands of miles of Pennsylvania streams and can contaminate private wells near mine workings.

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